when he scored two goals in a Copenhagen XI game against the 1958 Brazilian world champions team, which two years earlier had another largely unknown 17-year-old Pelé making his debut on the world stage. The two would meet again playing for their respective club teams later in their careers, but in a strange twist of fates while Pelé was essentially banned from playing outside Brazilian team(s), Nielsen would be banned from playing on the Danish national team. As the Danish Football Association did not allow professionals to represent the Danish national team until 1971, Nielsen was banned from the national team at 19 years old when he joined Bologna, and would not play another national team match. This was a great frustration to Harald Nielsen, which he repeatedly voiced in interviews with Danish media. Outside football Nielsen was a prolific entrepreneur who started numerous companies. Just after ending his career he started a firm together with his wife, former actress Rudi Nielsen, which imports Italian leather works to Scandinavia. Nielsen and Hansen met on the set of Far til fire med fuld musik in 1961 and married in 1963. In the 1970s Nielsen became involved in professionalising football in Denmark, and in 1977 he and later Danish Minister of Science Helge Sander planned to found a professional Danish football league. As a consequence of these plans, Danish Football Association finally allowed professional football in Denmark from 1978. Harald Nielsen along with Alex Friedman founded – and became the first chairman of FC København A/S later Parken Sport & Entertainment whose primary activity was the Danish club FC København from 1992–1997, he stepped down from the board in 2007 and became the clubs first honorary member. He was Protektor for the Legends Club and until his death watched all the home matches of FC København from Parken's A-stand. He was chairman and co-owner/founder of the largest summer house building company in Denmark. He was president of the Rebild National Park Society in 1997–2007. He led the Gunnar Nu Foundation for 18 years until 2009 and presided the distribution of over DKK 9 million to Danish sports in those years. From 2003 until his death, he was chairman/co-owner of ABSI A/S., one of the leading trade and loyalty solutions companies in Scandinavia. He wrote six books during his football career, which became known as the "Harald-Books" during the 1960s. He died on